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If bi=1-ai na = underset(i=1)overset(n)S...

If `b_i=1-a_i na = underset(i=1)overset(n)Sigma a_i, nb = underset(i=1)overset(n)Sigma b_i " then " underset(i=1)overset(n)Sigma a_b_i+underset(i=1)overset(n)Sigma(a_i-a)^2=`

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